The "perl" repository has been renamed to "core"
The "perl" repository has been renamed to "core"

The rename took place in [4d5b254e654d3](https://github.com/rakudo/rakudo/commit/4d5b254e654d3ec07f90128c4e07314d70b95402).
Reflect that change here.
tbrowder/doc,tbrowder/doc,MasterDuke17/doc,tbrowder/doc,tbrowder/doc,MasterDuke17/doc,MasterDuke17/doc,MasterDuke17/doc